html {
    height: 100%;
}

body {
    margin: 0;
    height: 100%;
    background: #f8f8f8;
    overflow: hidden;
}

.hide {
    display: none;
}

.left {
    float: left;
}

.right {
    float: right;
}

.clearfix::after {
    display: block;
    content: "";
    clear: both;
}

.mask {
    width: 100%;
    height: 100%;
    background: rgba(47, 47, 47, .4);
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
}

@keyframes mask-show {
    0% {
        transform: translateX(-100%);
    }
    25% {
        transform: translateX(-75%);
    }
    50% {
        transform: translateX(-50%);
    }
    75% {
        transform: translateX(-25%);
    }
    100% {
        transform: translateX(0);
    }
}

.icon {
    width: 1.2em;
    height: 1.2em;
    vertical-align: -0.15em;
    fill: currentColor;
    overflow: hidden;
}
